Year	Percent
1999-01-01	8.625
2000-01-01	7.050
2001-01-01	6.625
2002-01-01	7.550
2003-01-01	8.200
2004-01-01	8.425
2005-01-01	8.475
2006-01-01	8.325
2007-01-01	7.525
2008-01-01	7.025
2009-01-01	7.950
2010-01-01	8.375
2011-01-01	7.175
2012-01-01	7.575
2013-01-01	8.475
2014-01-01	8.625
2015-01-01	8.550
2016-01-01	7.925
2017-01-01	7.150